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H A Dfrontend.c8491c0ab Tue Apr 26 14:50:04 GMT 2022 florian <florian@openbsd.org> Do not send a hostname option when we don't have a hostname.

The minimum length of a hostname is 1 according to RFC 2132.
Found the hard way by Ibrahim Khalifa (ibo AT trukonsult.se) with DHCP
Relay on a Cisco ASA in the installer where we don't have a hostname
yet.
Ibrahim also provided a diff which I simplified a bit.
OK tb